Alert archive / New York / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 77, NWS Buffalo, NY

July 20, 2013Erie County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 20, 2013, 4:02 AM EDT for Erie County, New York. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 20, 2013, 4:02 AM EDT (08:02 UTC)
Expired: Jul 20, 2013, 4:45 AM EDT
In force: 43 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

County Erie County, NY

The radar

The Buffalo radar (KBUF), 11 km from the middle of the area, began a volume at 08:06 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 8.0 hours before the alert went out and 11 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1370 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 1402 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

440 
WUUS51 KBUF 200802
SVRBUF
NYC029-200845-
/O.NEW.KBUF.SV.W.0077.130720T0802Z-130720T0845Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
402 AM EDT SAT JUL 20 2013

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN ERIE COUNTY IN WESTERN NEW YORK

* UNTIL 445 AM EDT

* AT 356 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 5 MILES NORTHWEST OF ATHOL
  SPRINGS...OR 6 MILES WEST OF LACKAWANNA...AND MOVING EAST AT 40
  MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  BUFFALO...
  WEST SENECA...
  DEPEW...
  LANCASTER...
  ALDEN...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN THE PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 4274 7892 4279 7886 4287 7890 4294 7892
      4296 7894 4307 7873 4306 7846 4289 7846
      4282 7851 4272 7897 4273 7897
TIME...MOT...LOC 0801Z 251DEG 34KT 4283 7889

$$

THOMAS

2 follow-up statements

673 
WWUS51 KBUF 200825
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
425 AM EDT SAT JUL 20 2013

NYC029-200845-
/O.CON.KBUF.SV.W.0077.000000T0000Z-130720T0845Z/
ERIE NY-
425 AM EDT SAT JUL 20 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 AM EDT
FOR NORTHERN ERIE COUNTY...

AT 419 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR SLOAN...OR NEAR
BUFFALO...MOVING NORTHEAST AT 30 MPH.

SOME LOCATIONS IN THE WARNING INCLUDE...
  DEPEW...
  LANCASTER...
  HARRIS HILL...
  CLARENCE CENTER...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN THE PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 4294 7892 4307 7873 4306 7847 4289 7846
      4286 7853 4279 7886 4287 7886
TIME...MOT...LOC 0825Z 245DEG 26KT 4288 7876

$$

THOMAS

507 
WWUS51 KBUF 200842
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
442 AM EDT SAT JUL 20 2013

NYC029-200852-
/O.EXP.KBUF.SV.W.0077.000000T0000Z-130720T0845Z/
ERIE NY-
442 AM EDT SAT JUL 20 2013

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ERIE COUNTY WILL
EXPIRE AT 445 AM EDT...

AT 442 AM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE SEVERE
THUNDERSTORM THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO LONGER
SEVERE...THUS THE WARNING HAS BEEN ALLOWED TO EXPIRE.

LAT...LON 4294 7892 4307 7873 4306 7847 4289 7846
      4286 7853 4279 7886 4287 7886
TIME...MOT...LOC 0842Z 245DEG 26KT 4293 7861

$$

THOMAS

The office that day

Everything else NWS Buffalo, NY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 19, 8:01 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego, Wayne	59 min
Jul 19, 8:03 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	57 min
Jul 19, 8:20 PM EDT	Areal Flood Advisory	BUF	Erie, Genesee, Niagara, Orleans	3 hr
Jul 19, 8:32 PM EDT	Severe Thunderstorm Warning	BUF	Niagara	43 min
Jul 19, 8:49 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Wyoming	56 min
Jul 19, 8:51 PM EDT	Flash Flood Warning	BUF	Erie, Niagara	3 hr
Jul 19, 8:58 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis	32 min
Jul 19, 9:25 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara	65 min
Jul 19, 9:49 PM EDT	Special Marine Warning	BUF		56 min
Jul 19, 9:56 PM EDT	Special Marine Warning	BUF		64 min
Jul 19, 10:06 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	54 min
Jul 19, 10:21 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Wyoming	54 min
Jul 19, 10:33 PM EDT	Areal Flood Advisory	BUF	Erie, Genesee, Wyoming	3 hr
Jul 19, 10:49 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Wyoming	56 min
Jul 20, 12:46 AM EDT	Special Marine Warning	BUF		59 min
Jul 20, 1:18 AM EDT	Areal Flood Advisory	BUF	Erie, Genesee, Niagara, Orleans	3 hr
Jul 20, 1:21 AM EDT	Special Marine Warning	BUF		84 min
Jul 20, 2:43 AM EDT	Special Weather Statement	BUF	Ontario	32 min
Jul 20, 3:45 AM EDT	Special Marine Warning	BUF		60 min
Jul 20, 4:49 AM EDT	Small Craft Advisory	BUF		9 hr

Nearby

Severe Thunderstorm Warnings in New York, 2013 Every severe thunderstorm warning in 2013

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.